Just need to get out the crayon.
Yes, it will run them fine, 10 50 watt lights is 500 watts. you have a 4700 watt genny, that leaves you 4200 watts left over to run? table saw? Blender? an entire kitchen?
haha, all in fun.
as to the converter, you dont need it to run your lights, the lights are already 120V. A converter is only if you want to charge your batteries with your generator. which seeing how much genny you are going to be running is a really good idea.